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21-12-2021
Mathematics

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The 13th arithmetic sequence of whose common difference is d=7 and first term is A1=3

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Аноним Аноним

21-12-2021

Answer:

87

Step-by-step explanation:

difference = 7

A1 = 3

so let's imagine this arithmetic sequence as

3, 10, 17, 24 etc....

mathematically the sequence can be described as

An = a1 + (n - 1) d

A13 = 3 + (13 - 1) 7 = 3 + 12*7 = 87

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